Marine Marvair SeaMach 24 VDC Installation Manual

SeaMach 24 VDC

Rooftop Air Conditioners

SeaMach 24 VDC Rooftop
Air Conditioner

Installation Manual

24 VDC Rooftop Air Conditioner

Chapter 1: Safety Considerations .......................................................................... 2

Chapter 2: General Information ............................................................................ 3

Chapter 3: Air Conditioning Sizing ........................................................................ 3

Chapter 4: Selecting an Installation Location ......................................................... 4

Chapter 5: Installing the Roof Top Unit .................................................................4

Chapter 6: Securing the Air Conditioner to the Roof ...............................................8

Chapter 7: Electrical Wiring .................................................................................. 9

Chapter 8: Installing the Ceiling Assembly (9000 Series) ...................................... 11

Chapter 9: Completing the Installation (9000 Series) ........................................... 14

Chapter 10: Installation, Programming and Operation of the o-Touch Thermostat ..... 14

Chapter 11: Maintenance ...................................................................................... 20

Marvair

SeaMach 24 VDC Rooftop Air Conditioner Installation Manual 5/2013 Page 1 of 20

®

Division of AIRXCEL

PO Box 400 • Cordele, GA 31010

156 Seedling Dr. • Cordele, GA 31015

[phone] • Fax [phone]

Email: [e-mail]

www.marvair.com

Manufactured by:

®

, Inc

Marvair® Marine UK

Unit B8 • Arena Business Centre • Holyrood Close

Poole, Dorset BH17 7FL.

[phone]

www.marvair.co.uk

P/N 01991 5/2013 New

SeaMach 24 VDC

!

!

Rooftop Air Conditioners

Chapter 1 - Safety Considerations

These instructions are a general guide for installing the SeaMach 24 VDC roof top air conditioners. For

specic air conditioner details, it will be necessary to refer to the printed Customer Envelope Package
supplied with each air conditioner.

IMPORTANT NOTICE:

These instructions are for the use of qualied individuals specially trained and experienced in
installation of this type equipment and related system components.

Installation and service personnel are required by some states to be licensed. PERSONS NOT
QUALIFIED SHALL NOT INSTALL NOR SERVICE THIS EQUIPMENT.

NOTE:

The words “Shall” or “Must” indicate a requirement which is essential to satisfactory and safe product
performance.

The words “Should” or “May” indicate a recommendation or advice which is not essential and not
required but which may be useful or helpful.

Safety Considerations

This is the safety alert symbol . When you see this symbol on the Marvair® unit and in the instruction
manuals be alert to the potential for personal injury. Understand the signal word DANGER, WARNING
and CAUTION. These words are used to identify levels of the seriousness of the hazard.

DANGER

W ARNING

CAUTION

IMPORTANT is used to point out helpful suggestions that will result in improved installation, reliability

or operation.

To prevent the possibility of severe personal injury or equipment damage due to electrical shock,
always be sure the electrical power source to the appliance is disconnected.

Failure to comply will result in death or severe personal injury and/or property damage.

Failure to comply could result in death or severe personal injury and/or property damage.

Failure to comply could result in minor personal injury and/or property damage.

WARNING - SHOCK HAZARD

CAREFULLY FOLLOW ALL INSTRUCTIONS AND WARNINGS IN THIS BOOKLET TO AVOID
DAMAGE TO THE EQUIPMENT, PERSONAL INJURY OR FIRE.

Improper installation may damage equipment, can create a hazard and may void the warranty.

The use of components not tested in accordance with these units will void the warranty, may make the
equipment in violation of state codes, may create a hazard and may ruin the equipment.

SeaMach 24 VDC Rooftop Air Conditioner Installation Manual 5/2013 Page 2 of 20

WARNING

SeaMach 24 VDC

Rooftop Air Conditioners

Chapter 2 - General Information

OEM

Please make sure the Customer Envelope Package accompanies the air conditioner.

INSTALLER AND/OR DEALER

Please make sure the Customer Envelope Package is presented to the product consumer.

For more information about the contract, please review the sample contract located in the Operation and
Maintenance Instructions Booklet (Customer Envelope Package).

INQUIRIES ABOUT THE A/C UNIT

Inquiries to your Airxcel, Inc. representative or to Airxcel, Inc. pertaining to product installation should
contain both the model and serial numbers of the roof top air conditioner. All roof top air conditioning
units have model and serial number identication in two locations; (1) rating plate sticker may be viewed
by looking through the shroud louvers on the compressor side of the roof top air conditioning unit. The
rating plate sticker can be seen without removing the outer plastic shroud, (2) model/serial number sticker
(silver color) is located on the bottom of the basepan of the roof top air conditioner. If the air conditioner
is installed, the sticker may be viewed by lowering the ceiling assembly shroud.

Chapter 3 - Air Conditioning Sizing

The ability of an air conditioner to provide a comfortable environment for the consumer is dependent upon
the following conditions.

Air conditioners are rated primarily by their ability to remove heat. The thermal measurement used for
detecting a gain or loss of heat is the British Thermal Unit (BTU). One (1) BTU is the amount of heat
required to raise the temperature of one pound of water by one degree Fahrenheit. An air conditioner rated
at 13,500 BTUH can remove 13,500 BTU’s of heat in one hour.

The ability of an air conditioner to cool down a vehicle or maintain a consumer desired temperature is
dependent upon the heat gain of the vehicle. The physical size, the amount of window area, the quality
and amount of insulation, the position exposure to sunlight, the number of people using the vehicle and
the outside temperature may increase the heat gain to such an extent that the capacity of the air conditioner
is exceeded.
As a general rule, air supplied (discharge air) from the air conditioner will be 15°F to 20°F (11° C to

8.4°C) cooler than the air entering (return air) the ceiling assemblies bottom air grilles.

For example, if the air entering the air conditioner (the return air) is 80°F (26.7), the supply air (discharge
air) will be 60° to 65° F (11.1° to 18.3°C). As long as this temperature difference -15°F to 20° F (11° C to

8.4°C) is being maintained at the air conditioner, the air conditioner is operating properly.

SeaMach 24 VDC Rooftop Air Conditioner Installation Manual 5/2013 Page 3 of 20

SeaMach 24 VDC

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!

Rooftop Air Conditioners

Again, give careful consideration to the heat gain variables. During extreme outdoor temperatures, the
heat gain of the vehicle or vessel may be reduced by:

Keeping the vessel in a shaded area•
Keeping windows and doors closed•
Avoiding the use of heat producing appliances•
Using window shades (blinds and/or curtains)•

For a more permanent solution to high heat gain situations, additional insulation, window awnings and/or
window glass tinting should be considered.

Chapter 4 - Selecting An Installation Location

Is the roof of the vehicle or vessel capable of supporting both the roof top unit and ceiling assembly without
additional support structures? Inspect the interior ceiling mounting area to avoid interference with existing
structural members such as: bunks, curtains, tracks or room dividers. The depth of the ceiling assembly
shroud is 3” (7.6 cm). Be sure to check clearance for doors which must be swung open (refrigerator,
closets, cabinets).

Chapter 5 - Installing The Roof Top Unit

DANGER - SHOCK HAZARD

DISCONNECT ALL POWER BEFORE PERFORMING ANY CUTTING. CONTACT WITH
HIGH VOLTAGE CAN RESULT IN EQUIPMENT DAMAGE, PERSONAL INJURY OR
DEATH.

CAUTION

TO PREVENT DAMAGE TO THE WIRING AND BATTERY, DISCONNECT THE BATTERY
CABLE FROM THE POSITIVE BATTERY TERMINAL BEFORE PERFORMING ANY
CUTTING TO THE VEHICLE OR VESSEL.

Once the location for your air conditioner has been determined (See Chapter 4), a reinforced and framed
roof hole opening must be provided (may use existing vent hole). Before cutting into the roof, verify that
the cutting action will clear all structural members and crossbeams. Additionally, the location of any inner
roof plumbing and electrical supplies must be considered.

If a roof vent is already present in the desired mounting location for the air conditioner, the following A.
steps must be taken:

Remove all screws which secure the roof vent to the vehicle. Remove the vent and any additional 1.
trim materials. Carefully remove all caulking from around the roof vent opening to obtain clean
exterior roof surface.

It may be necessary to seal some of the old roof vent mounting screw holes which may fall outside 2.
of the air conditioner basepan gasket.

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SeaMach 24 VDC

Rooftop Air Conditioners

Examine the roof opening. If the opening is smaller than 14” x 14” (35.6 cm x 35.6 cm), the 3.
opening must be enlarged. If the opening exceeds 15” x 15” 38 cm x 38 cm), a mounting frame
must be field fabricated to reduce the opening size (See Figure 1).

If a roof vent opening is not used, a new opening (See Figure 1) will have to be cut into the vehicle B.
roof. A matching opening will also have to be cut into the interior vehicle ceiling. Be careful when

cutting the ceiling opening.

After the opening in the roof and interior ceiling are the correct size, a framed support structure must
be provided between exterior roof top and interior ceiling. The reinforced framed structure must
provide the following guidelines:

Capable of supporting both the weight of the roof top air conditioner and the interior ceiling 1.
assembly.

Capable of holding or supporting the roof outer surface and interior ceiling apart, so that when the 2.
roof top air conditioner and ceiling assembly are bolted together, no collapsing occurs.

Airxcel’s SeaMach air conditioner requires that the spacing from the vehicle roof top to the interior
ceiling be no less than 1” (2.34 cm). A typical support frame is shown in Figure 1.

The frame must provide an opening to allow passage for the power supply wiring. Route the supply
wiring through the frame at the same time the support frame is being installed.

IMPORTANT – Allow 24” (61 cm)of supply wiring through the support frame (working length).

After the support frame is installed, seal off all gaps between the frame and both the roof exterior
and the interior ceiling of the vehicle or vessel (cavity walls). Additionally, seal the gap around the
electrical supply wiring.

This air conditioner is to be installed in accordance with NFPA Standard 501C.C.

The roof top air conditioner must be mounted as near level from front to rear and side to side as is D.
possible when the vehicle is parked on a level plane. Figure 2 shows maximum allowable degree
deviations (mounting degrees from total surface at plane).

SeaMach 24 VDC Rooftop Air Conditioner Installation Manual 5/2013 Page 5 of 20

SeaMach 24 VDC

15 DEGREE MAX. ABOVE LEVEL 15 DEGREE MAX. ABOVE OR BELOW LEVEL

NOTE: IF UNIT IS INSTALLED UNLEVEL FRONT TO BACK, THE NOSE OR FRONT

OF THE UNIT MUST BE UP. DO NOT INSTALL NOSE DOWN.

ALLOWABLE OFFSET FOR ALL HEAT PUMPS

WITH ROTARY COMPRESSORS.

Rooftop Air Conditioners

SeaMach 24 VDC Rooftop Air Conditioner Installation Manual 5/2013 Page 6 of 20

FIGURE 2